package LCR;

public class mergeTwoLists {
    public ListNode mergeTwoLists(ListNode list1, ListNode list2) {

        ListNode cur = new ListNode(0);
        ListNode ret = cur;

        while(list1 != null & list2 != null) {
            if(list1.val < list2.val) {
                cur.next = list1;
                list1 = list1.next;
            }else {
                cur.next = list2;
                list2 = list2.next;
            }
            cur = cur.next;
        }
        if(list1 == null) {
            while(list2 != null) {
                cur.next = list2;
                list2 = list2.next;
                cur = cur.next;
            }
        }else if(list2 == null){
            while(list1 != null) {
                cur.next = list1;
                list1 = list1.next;
                cur = cur.next;
            }
        }
        return ret.next;

    }
}
